Blood values and your metabolism
Your blood values make your metabolism visible. Sugar, fats and thyroid all help decide how easily you lose weight. Look up a value below. Each one gives the normal range and what a deviation means.
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LDL/HDL Ratio
The LDL/HDL ratio is your LDL cholesterol divided by your HDL cholesterol, and below 3 counts as acceptable. If you are tracking yourself through a weight-loss programme, this is the worst number on your report to read your progress from. The reason is arithmetic, not health. During weight loss your triglycerides fall quickly. Your LDL is usually calculated from those same triglycerides, so the calculated LDL can actually rise. At the same time HDL dips in many people during the first months. Both halves push the ratio up while nothing has got worse. So track non-HDL cholesterol against your own baseline instead.
LH (Luteinizing Hormone)
LH (Luteinizing Hormone) is involved in the regulation of reproductive hormones. In older adults, LH levels naturally change as part of the ageing process, and monitoring may help your healthcare provider assess hormonal balance alongside other markers.
Leptin
Leptin testing provides insight into appetite regulation. For older adults, understanding leptin function supports weight management during age-related metabolic changes.
Leukocyte Differential
A leukocyte differential test measures the relative proportions of different types of white blood cells in your blood. It provides a detailed breakdown of your immune cell populations, offering valuable insight into your immune system's function.
Leukocytes (WBC)
Leukocytes are your white blood cells. In a supervised programme this number is most useful as a comparison with your own baseline. As a standalone check against a table it says far less. At the laboratory that runs the test the ordinary adult range runs from 4.3 to 10.0 x10^9/L. Within that wide range everyone has their own level. A value of 5.0 means something different for someone who started at 4.5 than for someone who started at 8.5. That is why the baseline at the start of your programme is the reference point that really counts.
Lipase
Lipase monitoring is important for older adults, as pancreatic enzyme production may decrease with age, potentially affecting fat digestion and nutrient absorption. Regular testing helps identify age-related changes in pancreatic function early.
Lipoprotein(a)
Lp(a) stands for lipoprotein(a): an LDL-like particle with an extra protein attached to it. Its level is more than 90 percent written into your genes and barely changes across your life. For anyone already taking a cholesterol-lowering drug, that comes as a surprise. A statin lowers your LDL powerfully, but leaves Lp(a) untouched and in fact lifts it slightly. So your medicine does not cover this number. That is no reason for alarm, but it is a reason for a conversation. A raised result does not automatically mean another pill; it means a sharper look at what you can still steer at your age: your blood pressure, your ApoB and your blood sugar.
Liver Function Test (LFT)
A liver function test is particularly important for older adults, as liver function may gradually decline with age. The use of multiple medications, age-related metabolic changes, and reduced regenerative capacity make comprehensive liver screening a valuable part of healthy ageing.
Lymphocytes
Lymphocytes are white blood cells central to your defence against viruses and to immune memory. As you get older, the make-up of immune defence can change. A high count often fits a viral infection, while a low count can occur with stress or certain infections. Your doctor reviews the value in context.
MCH (Mean Corpuscular Hemoglobin)
MCH is the average amount of haemoglobin in one red blood cell. A smaller appetite means a smaller intake of iron, B12 and folate, and MCH shifts in a different direction depending on which is short. Learn what your value can mean.
MCHC (Mean Corpuscular Hemoglobin Concentration)
MCHC is the average concentration of haemoglobin inside your red blood cells. Eating less over a long period lowers iron intake, and MCHC is one of the values that shows the effect. Learn what your value can mean.
MCV (Mean Corpuscular Volume)
Your MCV is too high when your red blood cells are on average larger than roughly 100 fl; the reference range shown on this page runs from 80 to 100 fl for adults. Inside a GLP-1 or weight-loss programme, a high MCV value is usually not a sign that your programme is going wrong. It is a signal about your intake and your absorption: vitamin B12 and folate come under pressure with a strongly restricted intake and after bariatric surgery. MCV reacts slowly, because it only shifts once a new generation of red cells has been made. So compare your value with your own baseline, not with a table.
Magnesium
Magnesium supports bone density, heart rhythm, and cognitive function — all areas that may need extra attention as you age. Regular monitoring helps maintain quality of life.
Magnesium (Intracellular)
Intracellular magnesium testing offers a deeper look at magnesium status, which is important for maintaining bone strength, heart health, and cognitive function as you age.
Methylmalonic Acid (MMA) (Blood)
MMA Blood measures a functional B12 marker that may be particularly informative for older adults. As B12 absorption and metabolism may change with age, MMA testing could reveal deficiencies not detected by standard B12 blood tests.
Methylmalonic Acid (MMA) (Urine)
MMA Urine provides a non-invasive assessment of functional B12 status, which may be especially convenient for older adults. This test can help detect cellular B12 deficiency without the need for a blood draw.
Microalbumin (Urine)
Microalbumin monitoring becomes increasingly important with age, as kidney function naturally declines over time. For seniors managing diabetes, hypertension, or taking multiple medications, regular testing supports early detection of kidney changes and helps guide treatment adjustments.
Monocytes
Monocytes are the largest white blood cells. In your tissue they become macrophages. In fat tissue especially, those sustain the low-grade inflammation that comes with excess weight. That makes this number interesting to follow during a weight-loss programme. It is a slow value, though. Do not expect anything from it in the first few weeks. Your blood sugar and triglycerides move far sooner. Below you can read when your monocytes do show something.
Neutrophils
Neutrophils are the most common white blood cells and your first defence against bacterial infections. As you get older, immune defence can gradually change. A high count often fits an infection or inflammation, while a low count can leave you more vulnerable. Your doctor reviews it together with the rest of your blood count.
Non-HDL Cholesterol
Non-HDL cholesterol is the one lipid number that stays honest while you are losing weight. Take your HDL away from your total cholesterol and what is left is non-HDL: the cholesterol riding inside every particle that can settle into an artery wall. That matters during a weight-loss programme because triglycerides usually drop fast and early. An LDL result is normally produced by a formula that leans on those same triglycerides, so it lurches about while nothing biological has actually shifted. Non-HDL uses no formula and needs no fasting, so it does not lurch. The 3.3 mmol/l printed on your result is a population reference value, not a goal.
Omega 3 + 6
Balancing omega-3 and omega-6 can help manage chronic inflammation, which becomes increasingly important for cardiovascular and cognitive health as you age.
Omega-3 Index
The Omega-3 Index is especially valuable for healthy ageing, as omega-3 fats support cardiovascular, cognitive, and joint health in later years.
Oxidized LDL
oxLDL accumulates over time and is a key driver of atherosclerosis. Monitoring in later years supports targeted cardiovascular risk management.
Phosphorus
Phosphorus balance becomes important as kidney function and bone metabolism may change with age. Monitoring supports bone health and metabolic stability in later years.