Total Proteing/L
Typical optimal range
Optimal range varies by lab and individual context.
Reference ranges vary between laboratories depending on the analyser and local population used to set them, so always interpret your result against the range printed on your own lab report. These figures are indicative — the range printed on your own lab report is the definitive one for your results.
Interpretation of total protein follows NHS and laboratory medicine guidance; the Association for Clinical Biochemistry and Lab Tests Online UK provide the clinical framework used by UK laboratories.
What is Total Protein?
Total protein is a blood test that measures the combined concentration of all proteins circulating in your plasma, predominantly albumin and globulins. These proteins are made mainly by the liver and by immune cells, and they carry out essential functions including transporting hormones and nutrients, maintaining fluid balance, and supporting immune defence. Measuring total protein gives clinicians a broad snapshot of nutritional status, liver and kidney function, and immune activity, and it is usually interpreted alongside individual protein fractions such as albumin and globulins for a fuller picture.
What a high Total Protein means
A raised total protein result is usually a prompt to investigate further rather than a cause for alarm on its own. It most often reflects either dehydration or an increase in one of the globulin fractions, which can have several causes ranging from benign to ones that benefit from prompt medical review.
- Dehydration. When the body loses water, blood becomes more concentrated, causing protein levels to appear artificially elevated. This is one of the most common explanations and is easily checked by rehydrating and repeating the test.
- Chronic infection or inflammation. Ongoing infections, autoimmune conditions, or chronic inflammatory states can drive the liver and immune cells to produce more globulin proteins as part of the immune response, genuinely raising total protein over time.
- Paraprotein or plasma cell disorders. In some conditions, such as myeloma or other plasma cell disorders, abnormal immune cells produce large amounts of a single abnormal protein (a paraprotein). A significantly elevated total protein alongside other suggestive features would prompt a GP to arrange a protein electrophoresis test.
A single elevated reading in isolation, especially when albumin is normal, is often explained by dehydration or lab timing; it gains more clinical significance when persistently raised or accompanied by other abnormal results.
What a low Total Protein means
A low total protein result suggests the body is either not making enough protein, losing protein somewhere, or not absorbing enough dietary protein, and it is generally the more clinically important direction that warrants follow-up.
- Liver disease. The liver synthesises albumin and many other plasma proteins, so significant liver impairment — from any cause — can reduce total protein. It would typically be assessed alongside liver enzymes, bilirubin, and albumin.
- Malnutrition or malabsorption. Inadequate dietary protein intake, or conditions that impair absorption such as coeliac disease or inflammatory bowel disease, can reduce circulating protein levels over time. A GP may explore nutritional history and gut health if this is suspected.
- Protein-losing conditions. The kidneys or gut can leak protein; nephrotic syndrome and protein-losing enteropathy are examples where protein is lost from the body faster than it can be replaced, leading to low plasma levels.
Mild reductions should be interpreted in the context of the full clinical picture; haemodilution during pregnancy, for example, can physiologically lower total protein without indicating disease.
Should I be worried?
A single total protein result outside the reference range, particularly if only marginally so, does not mean something is seriously wrong — many readings normalise on repeat testing once factors like hydration are addressed. That said, it is worth mentioning an out-of-range result to your GP, especially if it is notably high or low, or if you have symptoms such as unexplained weight loss, persistent fatigue, swelling, or frequent infections. Your GP will likely look at your total protein alongside albumin, globulin fractions, liver and kidney function tests, and possibly a full blood count to build a complete picture before deciding whether further investigation is needed. Repeat testing is often the most sensible first step.
What actually helps
If a low total protein related to diet or lifestyle has been identified, the following evidence-based approaches can support healthy protein levels.
- Adequate dietary protein. UK dietary guidance (SACN) recommends a reference nutrient intake of 0.75 g of protein per kilogram of body weight per day for adults, though needs are higher during illness, recovery, pregnancy, or older age. Spreading protein intake across meals supports efficient use.
- Treat underlying conditions. Where low protein reflects malabsorption or a medical condition, managing the root cause — under GP or specialist guidance — is the most effective lever. Dietary changes alone will not correct protein loss from the kidneys or gut.
- Limit excessive alcohol. Heavy alcohol intake is a leading cause of liver disease in the UK, which in turn impairs protein synthesis. Keeping within UK Chief Medical Officers' low-risk guidelines (no more than 14 units per week) supports liver health.
- Maintain a balanced, varied diet. General nutritional adequacy — including adequate energy intake — is necessary for the liver to synthesise proteins efficiently; very low-calorie or highly restrictive diets can compromise protein status even when protein intake appears sufficient.
There is good supporting evidence for the following foods in maintaining adequate protein status and overall metabolic health.
Lean meat and poultry
High-quality complete protein sources providing all essential amino acids the liver requires for protein synthesis.
Fish and seafood
Rich in complete protein and, in oily varieties, omega-3 fatty acids that have anti-inflammatory properties supporting liver function.
Eggs
One of the most bioavailable protein sources available and a practical way to meet daily protein needs.
Legumes (lentils, chickpeas, beans)
Good plant-based protein sources that also provide fibre; combining with grains improves the amino acid profile for those avoiding animal products.
Dairy and dairy alternatives (fortified)
Milk, yoghurt, and cheese are well-established protein sources; fortified plant-based alternatives can contribute if chosen carefully for protein content.
Wholegrains
Contribute modest amounts of protein alongside B vitamins and minerals that support overall metabolic function and energy needed for protein synthesis.
Track your own Total Protein
Upload a lab PDF and Better Days trends Total Protein over time, flags it when it drifts, and suggests foods that help.
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Sources & further reading
These are reputable UK health resources for further reading. This page is written to be consistent with their guidance but is not a substitute for them.
For information only — not medical advice, and not individually reviewed by a clinician. Reference ranges vary by lab and individual. Discuss any results with a qualified clinician before making changes.