Free tools to read your own blood test results. Each one shows where your number sits, what that usually means and what to ask your doctor. Every tool works with both US units (such as mg/dL) and UK units (such as mmol/L).
Everything is worked out on your device. Nothing you type is saved or sent anywhere.
Blood test checkers
TSH checker
See where your TSH sits against US and UK ranges, with your lab’s own range and an optional free T4 result.
mIU/L (same as µIU/mL). Free T4 in pmol/L or ng/dL.
Vitamin D checker
Check your 25(OH)D result on US or UK cut-offs, with notes for supplements, vitamin D2 and pregnancy.
ng/mL (US) or nmol/L (UK).
HbA1c and blood sugar checker
See whether your HbA1c sits in the normal, prediabetes or diabetes range on ADA or NICE cut-offs. Add a fasting glucose if you have one.
% (US) or mmol/mol (UK). Glucose in mg/dL or mmol/L.
Ferritin checker
Check your iron stores by sex and menopause status, with optional CRP and transferrin saturation.
ng/mL (US) or µg/L (UK). The numbers are the same.
Cholesterol checker
Enter total cholesterol, LDL, HDL and triglycerides from your report and compare them with US or UK targets.
mg/dL (US) or mmol/L (UK).
Vitamin B12 checker
See whether your total B12 is low, in the gray zone or fine, and which symptoms or medicines change the next step.
pg/mL or ng/L (same numbers), or pmol/L.
Kidney function checker
Place your eGFR and urine ACR on the KDIGO kidney chart, with notes on what can throw off a result.
eGFR in mL/min/1.73m². ACR in mg/g (US) or mg/mmol (UK).
Blood test unit converter
Got a US result and a UK range, or the other way round? Convert glucose, HbA1c, cholesterol, vitamin D, B12, creatinine, thyroid hormones and many more common tests between US and UK units.
mg/dL to mmol/L, % to mmol/mol, ng/mL to nmol/L, pg/mL to pmol/L and back.
How our tools work
- Each checker uses published cut-offs from bodies such as NICE, the NHS, the American Diabetes Association, KDIGO and the Endocrine Society. The guide under each tool names its sources.
- Labs set their own reference ranges. Where your report prints a range, you can type it in and the checker will use it.
- The tools give education, not a diagnosis. Your doctor knows your history and will interpret your result.
- Written and reviewed by Dr. Mustafa Sakr, MBBCh. Want a plain-English guide to all your common tests? Get our free guide.
These tools are for education only and aren’t medical advice, a diagnosis or a substitute for your own doctor. Reference ranges vary between laboratories. Always interpret results with a qualified clinician. See our medical disclaimer.