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How To Improve Home Blood Test Results

We provide some tips and advice on how to improve your results.

iPhone showing vitamin d test results

Whether your results are within the normal range or outside, it can be hard to know what to do with the insight you’ve gained.

We take a look at each of the biomarkers in our Better You Health Check test and provide tips on how to improve results that are outside the normal ranges.  As well as advice on why you should keep tracking even if your results are normal.

Improving Energy, Mood & Immune Health

Our Better You health test checks biomarkers key to energy, mood, immune health and general wellbeing.

Vitamin B12

Vitamin B12 is known as an essential nutrient which means the body is unable to produce it, so we must get it through our diet. It is key to the normal function of the brain and nervous system as well as the formation of red blood cells and helps to create DNA. Vitamin B12 enables the release of energy by aiding the body in the absorption of folic acid (folate/B9). 

Vitamin D

Vitamin D is needed for the absorption of calcium in the gut and helps to maintain optimal calcium and phosphate levels within the body to enable normal bone mineralisation to prevent involuntary muscle contraction known as hypocalcaemia tetany.  It also plays a role in reducing inflammation within the body, supporting cell growth, neuromuscular and immune function as well as the metabolism of glucose.


Folate, or vitamin B9 is another essential nutrient we can only get through our diet. It works with B12 to produce healthy red blood cells, the formation of DNA and to enable nerves to function effectively.


Ferritin is a blood protein that contains iron and is a good indicator for the amount of iron the body stores. It makes iron available for cellular processes in the body and protects lipids, DNA and proteins from the potentially toxic effects of iron1.


Cholesterol is essential to helping produce cell membranes in all tissues and organs within the body, so it pretty crucial! It is also key to the production of hormones. Cholesterol is produced by the liver and we also get cholesterol from our diet. There are two types of cholesterol, LDL which is the bad kind and HDL which is the good kind. High levels of LDL are a risk factor for heart disease.


Triglycerides are a type of fat found in the blood and is the body’s main storage of fat which it uses for energy. Like cholesterol, it is made by the liver and we can also get it through diet. High levels of triglycerides increase the risk of developing heart disease.

Your Results Are Below The Normal Range

Low Vitamin B12 Levels

The average level of vitamin B12 in women is 114 pmol/L and 111 pmol/L for men, with the normal range being anything between 37.5 pmol/L and 188 pmol/L.

Active B12 Statistics Infographic

Any result lower than 37.5 pmol/L is considered in the lower range of normal and needs addressing.

Symptoms of Low Vitamin B12

Having low vitamin B12 levels can lead to vitamin B12 deficiency, the symptoms of which include:

  • Fatigue
  • Weakness
  • Loss of appetite
  • Weight loss
  • Constipation
  • Confusion

Vitamin B12 deficiency is often caused by malabsorption of food, anaemia, or a diet deficient in good sources of B12.

How To Increase Vitamin B12 Levels

The best way to increase your vitamin B12 levels is through diet. Although depending on your results you may be advised to take a supplement. Good sources of B12 include beef, chicken, trout, salmon, cheese, milk, yogurt and eggs. Try to avoid taking too much vitamin C as this can limit the absorption of B12. According to NHS guidelines adults (those over 18 years of age), need 1.5 micrograms of B12 a day.

Read more about foods that are rich in vitamin B12.

Low Vitamin D Levels

In one of our studies into vitamin D deficiency we found that 74% of people have vitamin D levels below the optimum level for good health.  The optimum level of vitamin D is between 75 nmol/L and 175 nmol/L. Anything below 50 nmol/L is considered insufficient and levels <25 nmol/L is considered deficient.

Infographic of Vitamin D Statistics In The UK

Most adults in the UK are deficient in vitamin D, particularly during the winter months when more time is spent in doors and the sun we do get is weaker.

Symptoms of Low Vitamin D

Symptoms of vitamin D deficiency include:

  • Depression
  • Hair loss
  • Fatigue
  • Muscle pain
  • Recurrent infections
  • Bone pain

How To Increase Vitamin D Levels

There are two ways to increase your vitamin D levels, one is through the absorption of sunlight through the skin and the other is through diet.

During winter months the NHS advises that all adults should take 10 micrograms (400ui) of vitamin D a day between October and March to prevent vitamin D deficiency. If you are deficient then taking 1000ui a day of vitamin D3 between tests should bring your levels back up. However, do seek medical advice on how much you need to take based on your results – our doctor should provide you with this information as part of their comments on your results.

Read more about vitamin D deficiency.

Low Folate (B9) Levels

The average level of folate is between 8.83 nmol/L and 60.8 nmol/L with the average result being 21.9 nmol/L.  Results below the average level is considered low.

Symptoms of Low Folate

Folate levels are analysed alongside vitamin B12 as both biomarkers can indicate macrocytic anaemia. This is where red blood cells are unable to carry oxygen as efficiently and can result in large red blood cells. Symptoms of macrocytic anaemia are:

  • Loss of appetite or weight
  • Brittle nails
  • Fast heartbeat
  • Fatigue
  • Diarrhoea
  • Pale skin
  • Shortness of breath
  • Poor concentration or confusion

How To Increase Folate Levels

Folate can only be obtained through food, although in some cases a supplement may be recommended (generally in pregnant women). Good sources of folate include green, leafy vegetables such as kale, cabbage and spinach, wholegrain foods, chickpeas and kidney beans and liver.

Low Ferritin Levels

The normal range of ferritin within the body is between 13µg/L and 150µg/L. Borderline low levels are between 12-13µg/L, anything below 12µg/L is considered low. Low ferritin levels can be an indicator for iron deficiency anaemia.

Symptoms Of Low Ferritin Levels

The main symptoms of low ferritin levels include:

  • Pale skin
  • Fatigue
  • Very low energy levels
  • Headaches
  • Difficulty breathing
  • Dry skin and hair
  • Restless leg syndrome
  • Increased heartbeat

How To Increase Ferritin Levels

The best way to increase iron levels is through diet, although you may be advised by a doctor to take a supplement depending on your results.  The best sources of iron are liver, red meat, beans (kidney beans, chickpeas, butter beans etc), lentils, nuts, seeds, dried fruit, spinach, kale and swiss chard (dark green leafy veg).  According to NHS guidelines, adult women should consume 14.8mg of iron a day (but only 8.7mg a day over the age of 50), and men over the age of 18 should consume 8.7mg per day. 

Low Levels Of Cholesterol

Total cholesterol levels in healthy adults should be 5 mmol/L or less. LDL levels should be 3 mmol/L and HDL levels should be above 1 mmol/L. Total cholesterol and LDL cholesterol levels should be low, but low HDL levels can increase the risk of heart disease as it plays a role in ridding the body of LDL cholesterol (the bad kind).

Symptoms of Low Cholesterol

Cholesterol levels should be low, but very low cholesterol levels that aren’t low due to medication should be investigated.  Although more research needs to be carried out there is evidence that very low cholesterol levels can have a negative impact on mental health2. A study found that young women with low cholesterol were more likely to suffer from anxiety and depression.  It is thought that this could be due to cholesterol’s role in producing hormones and low levels may affect brain function. However, low levels are not common, the biggest issue in the Western world is high cholesterol levels.

How To Increase HDL Levels

Eating food high in fibre, fatty fish such as salmon, olive oil, whole grains, beans and nuts will all help to increase your levels of HDL. Physical exercise will also help raise your HDL levels. 

Low Levels Of Triglycerides

The normal level of triglycerides in the body are less than 1.7 mmol/L. Like cholesterol, it’s good to have low levels of triglycerides in the body to reduce the risk of heart diseases.

Symptoms Of Low Triglyceride Levels

There isn’t a range for low triglycerides, however, a very low result may need further investigation as it could indicate an underlying health condition.

Recipes To Increase Biomarker Levels

Below are a selection of recipes to help increase, or maintain, your levels of B12, folate and iron.

Your Results Are Above The Normal Range

High Levels Of Vitamin B12

It is not common to have naturally high vitamin B12 levels, however, high B12 levels without supplementation could be indicative of an underlying health condition such as liver or kidney problems or diabetes, so should be investigated further.

High Levels Of Vitamin D

Again, unless over supplementing, vitamin D levels are not naturally high. You can suffer from vitamin D toxicity if you take too much vitamin D supplement, signs of vitamin D toxicity include:

  • Nausea
  • Constipation
  • Headaches
  • High blood pressure
  • Kidney stones
  • Calcium toxicity

High Levels Of Folate

Having high folate levels does not generally cause the body any problems, however, it can indicate vitamin B12 deficiency.

High Total Cholesterol Levels

Mildly high cholesterol levels are between 5mmol/L and 6.4mmol/L, moderately high is between 6.5mmol/L and 7.8mmol/L and very high cholesterol is above 7.8mmol/L. You doctor will be able to advise you of the best course of action if your cholesterol levels are raised.

In some cases, changing your diet to one that is low in saturated fats, salt and sugar, and high in unsaturated fats, fibre, whole grains and pulses will be enough to bring your cholesterol down. If not, your doctor may prescribe medication.

High Triglyceride Levels

Borderline high levels of triglycerides are between 1.8 to 2.2 mmol/L, high is between 2.3 to 5.6 mmol/L and very high is anything above 5.7 mmol/L.  If you have high triglycerides it increases your risk of heart disease, especially if LDL cholesterol levels are high as well.

The most common cause of high triglycerides are obesity and poorly controlled diabetes. Losing weight and improving your diet will help improve levels if you are overweight and better management of diabetes will also help lower levels. If your levels are high you should seek advise from your GP.

High Levels Of Ferritin

High ferritin levels could be a sign of iron overload which may be due to an inherited condition called haemochromatosis which can cause:

  • Fatigue or feeling tired all the time
  • Feeling weak
  • Joint pain
  • Weight loss
  • Women may have irregular periods
  • Men may find it difficult to get or keep an erection

Other causes of high ferritin levels include obesity, kidney failure, inflammation, liver problems and rheumatoid arthritis.

High levels should be investigated further by seeing your GP.

Your Levels Are Within The Normal Range

If your levels are all within the normal range than you can be pretty pleased that you are in good shape.  However, if you took the test to investigate reasons for particular symptoms then you should visit your GP to investigate further.

Otherwise, it’s important to continue to track your levels. Why? Because we are all unique individuals, so although there are recommended ranges for the levels of our body’s biomarkers there can be a lot of variation between individuals. That’s why it’s important to establish your own, personal biomarker profile so you know what’s normal for you. 

Taking more than one test will:

  1. Allow you to develop a clear picture of your own unique biological profile and determine what ‘normal’ is for you.
  2. Allow you to accurately measure what lifestyle changes have the greatest impact on your health, and target those specifically.
  3. Identify any changes early on.

The more data points you have, the better our experts can identify the Critical Difference Threshold for you, and therefore decide whether a significant physiological change has happened.

The more regularly you test, the clearer the picture of your performance and health, and the more accurately we can help you identify issues before they become problems.

Better You Health Check – Twin Pack

Our new twin pack test kit challenges you to improve key markers for good health between two test points. Measure and track key biomarkers essential to health including B12, folate, ferritin, vitamin D and cholesterol. By improving these biomarkers between tests you can optimise your energy levels, improve your mood, support your immune system, heart health and bone and muscle strength.
New Test
Better You Health Check – Twin Pack
9 Biomarkers Included
Test and track 9 biomarkers essential to overall wellbeing with our new twin pack test kit.
Medically Reviewed
Dr Nicky Keay
Chief Medical Officer, BA, MA (Cantab), MB, BChir, MRCP.​
This article has been medically reviewed by Forth's Chief Medical Officer, Dr Nicky Keay.
Nicky has extensive clinical and research experience in the fields of endocrinology and sport and exercise medicine. Nicky is a member of the Royal College of Physicians, Honorary Fellow in the Department of Sport and Exercise Sciences at Durham University and former Research Fellow at St. Thomas’ Hospital.


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