Blood test guides
Which markers to test for your goal, how to read the results, and how to buy a test without overpaying. Every guide cites its sources.
Test these at home
SiPhox Health covers 14 to 62 biomarkers per test from a needle-free upper-arm draw. From $124 a test plus $25 shipping.
See SiPhox plansWhich blood tests for your goal
Blood test for fatigueWhich blood test for fatigue to ask for: CBC, ferritin, TSH, A1C, B12, vitamin D and more, what each...ReadBlood test for hair lossBlood test for hair loss: ferritin, iron, thyroid, vitamin D, B12 and androgens, what each result me...ReadPerimenopause blood testPerimenopause blood test: why FSH and estradiol swing, when testing helps (under 45 or unclear sympt...ReadPCOS blood testPCOS blood test list from the 2023 international guideline: testosterone, free androgens, DHEA-S, AM...ReadHypothyroidism blood testHypothyroidism blood test guide: why TSH comes first, when free T4, T3 and TPO antibodies matter, su...ReadLow testosterone blood testLow testosterone blood test guide: two morning tests under 300 ng/dL, free T and SHBG, LH, FSH and p...ReadPrediabetes blood testPrediabetes blood test ranges: A1C 5.7% to 6.4%, fasting glucose 100 to 125 mg/dL, OGTT 140 to 199. ...ReadHeart disease risk blood testHeart disease risk blood test guide: LDL, ApoB, Lp(a), hs-CRP, triglycerides, A1C and eGFR, the guid...ReadTRT blood testTRT blood test schedule per the Endocrine Society and AUA: testosterone, hematocrit, PSA and estradi...ReadBiological age testBiological age test guide: DNA methylation clocks vs blood-marker scores like PhenoAge, what the evi...ReadBlood work for athletesBlood work for athletes: ferritin and iron, vitamin D, hormones, T3 and the energy-deficiency (REDs)...ReadBlood test for weight lossBlood test for weight loss: A1C, lipids, ApoB, liver enzymes, TSH, kidney and nutrient markers to ch...Read
Blood test basics
Reading resultsHow to read blood test results line by line: H and L flags, reference ranges, units, optimal vs norm...ReadFasting before a blood testFasting before a blood test: which tests need it, how many hours, and whether water, black coffee, g...ReadBlood test abbreviationsBlood test abbreviations and meanings from A1C to WBC: an A to Z list of 100+ lab codes, report flag...ReadLipid panelLipid panel explained: cholesterol and triglyceride ranges, calculated vs direct LDL (Friedewald, Ma...ReadCMP blood testCMP blood test explained: all 14 comprehensive metabolic panel markers with normal ranges, what high...ReadCBC blood testCBC blood test explained: normal ranges for RBC, hemoglobin, hematocrit, MCV, RDW, WBC, platelets an...ReadLiver function testLiver function test results explained: ALT, AST, ALP, GGT, bilirubin and albumin ranges, hepatocellu...ReadKidney function testKidney function test explained: eGFR by the 2021 race-free CKD-EPI equation, creatinine, BUN, cystat...ReadHow often to get blood workHow often should you get blood work done? What US guidelines recommend by age, when to test more oft...Read
Buying guides
Best at-home blood testsThe best at home blood test in 2026, ranked: SiPhox, Function Health, Superpower, Rythm, InsideTrack...ReadBlood test subscriptionBlood test subscriptions compared: SiPhox, Function Health, Superpower, Rythm and InsideTracker by y...ReadAt-home blood test accuracyAre at-home blood tests accurate? What studies show for arm devices, finger prick and dried blood sp...ReadAt-home blood test costAt home blood test cost in 2026: prices by test type, cost per biomarker for SiPhox, Function, Super...ReadHSA and FSA blood testsHSA eligible blood tests: which at-home and online lab services take HSA and FSA cards, how to pay, ...ReadFull body blood testWhat a full body blood test checks (CBC, CMP, lipids, HbA1c, TSH), what longevity panels add (ApoB, ...ReadAt-home blood test for menThe at home blood test for men: which markers to track (testosterone, SHBG, estradiol, PSA, ApoB, Hb...ReadAt-home blood test for womenAt home blood test for women by life stage: cycle hormones and timing, thyroid, ferritin, vitamin D ...ReadWhat SiPhox testsWhat does SiPhox test for? Every biomarker on Longevity Essentials, Heart & Metabolic, Thyroid Focus...Read
Looking for one marker? Browse the biomarker library, or compare services on the comparisons page and in the SiPhox Health review.