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Learn how HLA-DR and CD38 flow cytometry measures activated T cells, what high results may mean, why ranges vary, and how clinicians plan follow-up.

Activated T-Cell Marker Test: HLA-DR, CD38, Immune Activation, and Inflammation

Understand how CD19 and CD20 B-cell counts are measured, why results may be high or low, how anti-CD20 therapy affects them, and which follow-up tests assess antibody function.

B-Cell Count Test: CD19, CD20, Immune Function, and Antibody Production

Learn what a CD4 count measures, how HIV affects helper T cells, what common ranges and thresholds mean, why results fluctuate, and how the test guides monitoring and infection prevention.

CD4 Count Test: Helper T Cells, Immune Function, HIV Monitoring, and Meaning

Learn how the CD4/CD8 ratio is calculated, what low or high results may mean, why an inverted ratio is nonspecific, and how the test adds context in HIV and immune monitoring.

CD4/CD8 Ratio Test: Immune Balance, High and Low Ratio, and Meaning

Learn what a CD8 count measures, why cytotoxic T-cell numbers may rise or fall, how viral infections affect results, and why cell quantity does not equal antiviral function.

CD8 Count Test: Cytotoxic T Cells, Immune Function, and Viral Response

Understand what a chemokine panel measures, why immune-signaling and cell-migration markers rise or fall, and how specialists interpret patterns and limitations.

Chemokine Panel Test: Immune Signaling, Inflammation, and Cell Migration Markers

Diagnostics

Home Diagnostics Page 63

Learn how a mixing study helps interpret prolonged PT or aPTT, including correction patterns, inhibitors, factor deficiencies, lupus anticoagulant, and next tests.

Mixing Study Test: Prolonged PT or aPTT, Inhibitors, Factor Deficiency, and...

Learn the typical PTT normal range, what high or low partial thromboplastin time means, and how PTT is interpreted with PT, INR, heparin, and clotting tests.

Partial Thromboplastin Time (PTT) Normal Range: Reference Values and Meaning

Learn what a platelet aggregation test measures, why abnormal platelet function happens, how aspirin affects results, and what follow-up testing may be needed.

Platelet Aggregation Test: Abnormal Platelet Function, Bleeding Disorders, Aspirin Effect, and...

Learn how platelet count and platelet function affect bleeding risk, including low platelet ranges, platelet dysfunction, testing options, procedure thresholds, and urgent warning signs.

Platelet Count and Platelet Function: Interpreting Bleeding Risk

Learn what the PFA-100 platelet function analyzer test measures, how closure time works, what prolonged results mean, and when follow-up testing is needed.

Platelet Function Analyzer (PFA-100) Test: Closure Time, Platelet Function, Bleeding Risk,...

Learn what a platelet function test measures, what abnormal results mean, how bleeding risk is judged, and which platelet disorders, medicines, and conditions affect results.

Platelet Function Test: Abnormal Results, Bleeding Risk, Platelet Disorders, and Meaning

Learn what a protein C activity test measures, what low protein C means, normal ranges, clot risk, inherited deficiency, causes of abnormal results, and follow-up testing.

Protein C Activity Test: Low Protein C, Blood Clot Risk, Deficiency,...

Learn how protein C, protein S, and antithrombin tests are interpreted, why low results can be misleading, and when thrombophilia testing is useful.

Protein C, Protein S, and Antithrombin: Interpreting Thrombophilia Testing

Learn what a protein S activity test measures, what low protein S means, how results are interpreted, and when deficiency raises blood clot risk.

Protein S Activity Test: Low Protein S, Blood Clot Risk, Deficiency,...

Learn the normal prothrombin time (PT) range, INR reference values, causes of high or low PT, warfarin targets, test preparation, and follow-up steps.

Prothrombin Time (PT) Normal Range: Reference Values and Meaning

Learn how PT, aPTT, and INR differ, what each clotting test measures, common abnormal patterns, typical ranges, medication effects, and when results need follow-up.

PT vs aPTT vs INR: What Is the Difference?

Learn how to interpret PT, INR, and aPTT patterns, including high INR, prolonged aPTT, warfarin and heparin effects, liver disease, vitamin K deficiency, and when follow-up matters.

PT, INR, and aPTT: Interpreting the Coagulation Panel Without Overdoing It

Learn what the reptilase time test measures, why results become high, how it differs from thrombin time, and how it helps separate heparin effect from fibrinogen disorders.

Reptilase Time Test: High Reptilase Time, Fibrinogen Disorders, Heparin Effect, and...

Learn the thrombin time test normal range, what high or low results mean, and how fibrinogen problems, heparin, liver disease, DIC, and related clotting tests affect interpretation.

Thrombin Time Test Normal Range: Reference Values and Meaning

Learn what a thromboelastography (TEG) test measures, how R time, K time, alpha angle, MA, and LY30 are interpreted, and what abnormal clot strength or clot breakdown results mean.

Thromboelastography (TEG) Test: Clot Strength, Bleeding Risk, Clotting Function, and Results

Learn what a von Willebrand disease panel measures, how vWF antigen, vWF activity, and factor VIII results are interpreted, and what low, borderline, or abnormal patterns mean for bleeding risk.

von Willebrand Disease Panel: vWF Antigen, vWF Activity, Factor VIII, Bleeding...

Learn what the von Willebrand factor activity test measures, what low vWF activity means, common normal ranges, bleeding risks, VWD patterns, causes, and follow-up tests.

von Willebrand Factor (vWF) Activity Test: Low vWF Activity, Bleeding Risk,...

Learn the vWF antigen test normal range, what low and high von Willebrand factor antigen results mean, and how doctors interpret vWF with activity, factor VIII, bleeding symptoms, and repeat testing.

von Willebrand Factor (vWF) Antigen Test Normal Range: Reference Values and...

Learn how aldolase and CK blood tests help interpret muscle enzyme results, including high CK, high aldolase with normal CK, rhabdomyolysis risk, and follow-up testing.

Aldolase and CK: Interpreting Muscle Enzyme Results

Learn what an aldolase blood test measures, what high aldolase means, normal range differences, muscle disease links, CK comparison, and follow-up testing.

Aldolase Blood Test: High Aldolase, Muscle Disease, Normal Range, and Results

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