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Understand the 1-mg low-dose dexamethasone suppression test, the common cortisol cutoff of 1.8 mcg/dL, causes of nonsuppression, and the follow-up used for Cushing screening.

Low-Dose Dexamethasone Suppression Test: Cushing Syndrome Screening and Results

Learn how an 8–9 a.m. cortisol test screens for adrenal insufficiency, what low and intermediate results mean, how ACTH helps identify the cause, and when stimulation testing is needed.

Morning Cortisol Test: Low Levels, Adrenal Insufficiency, and Results

Learn how a pheochromocytoma and paraganglioma panel uses plasma or urine metanephrines, normetanephrine, catecholamines, and controlled collection to interpret abnormal results.

Pheochromocytoma and Paraganglioma Test Panel: Metanephrines, Normetanephrine, Catecholamines, and Results

Learn what plasma epinephrine, norepinephrine, and dopamine results mean, why collection posture matters, common causes of high values, and when metanephrine testing is preferred.

Plasma Catecholamines Test: Epinephrine, Norepinephrine, Dopamine, and Results

Learn how plasma free metanephrine and normetanephrine testing screens for pheochromocytoma and paraganglioma, why supine rest matters, and how high or borderline results are evaluated.

Plasma Free Metanephrines Test: Pheochromocytoma and Paraganglioma Screening, High Levels, and Results

Learn what a high plasma normetanephrine result means, why supine rest matters, common false-positive causes, when clonidine testing is used, and how PPGL evaluation proceeds.

Plasma Normetanephrine Test: High Levels, Pheochromocytoma Screening, and Results

Diagnostics

Home Diagnostics Page 44

Learn what factor II activity measures, the normal prothrombin activity range, what low or high results mean, and which follow-up tests help explain abnormal clotting results.

Factor II (Prothrombin) Activity Normal Range: Reference Values and Meaning

Learn the factor IX activity test normal range, what low and high results mean, how hemophilia B severity is classified, and which follow-up tests help explain abnormal results.

Factor IX Activity Test Normal Range: Reference Values and Meaning

Learn what the factor V activity test measures, the normal range, what low or high results mean, and how factor V differs from factor V Leiden testing.

Factor V Activity Test Normal Range: Reference Values and Meaning

Learn what the factor VII activity test measures, normal adult and pediatric ranges, causes of low or high results, PT/INR patterns, bleeding risk, and follow-up testing.

Factor VII Activity Test Normal Range: Reference Values and Meaning

Learn what the factor VIII activity test normal range means, how low and high results are interpreted, and how factor VIII relates to hemophilia A, von Willebrand disease, bleeding risk, and clot risk.

Factor VIII Activity Test Normal Range: Reference Values and Meaning

Understand factor VIII and von Willebrand factor test results, including low VWF, hemophilia A patterns, von Willebrand disease, high factor VIII, bleeding risk, clot risk, and follow-up testing.

Factor VIII and von Willebrand Factor: Interpreting Bleeding and Clot Risk

Learn what the factor X activity test measures, the usual normal range, what low or high results mean, and how doctors interpret abnormal factor X levels with PT, aPTT, bleeding risk, medications, vitamin K status, and liver health.

Factor X Activity Test Normal Range: Reference Values and Meaning

Learn the factor XI activity test normal range, what low or high results mean, why bleeding risk varies, and what follow-up testing is commonly used.

Factor XI Activity Test Normal Range: Reference Values and Meaning

Learn what a factor XII activity test measures, the normal adult reference range, why low factor XII prolongs aPTT, and what abnormal results usually mean.

Factor XII Activity Test Normal Range: Reference Values and Meaning

Learn what a factor XIII activity test measures, what low factor XIII means, normal range guidance, bleeding risks, symptoms, causes, and follow-up testing.

Factor XIII Activity Test: Low Factor XIII, Bleeding Risk, Normal Range,...

Understand the FDP blood test, high FDP causes, DIC patterns, clot breakdown, normal ranges, FDP vs D-dimer, follow-up testing, and urgent warning signs.

Fibrin Degradation Products (FDP) Test: High FDP, DIC, Blood Clot Breakdown,...

Learn how fibrinogen and FDP patterns help identify DIC, including low fibrinogen, high FDP, platelet changes, PT/aPTT results, causes, and urgent warning signs.

Fibrinogen and FDP: Interpreting DIC Blood Test Patterns

Learn the normal fibrinogen blood test range, what high and low fibrinogen levels mean, and how doctors interpret results with PT, INR, aPTT, platelets, and D-dimer.

Fibrinogen Blood Test Normal Range: Reference Values and Meaning

High aPTT means blood is taking longer than expected to clot. Learn common causes, bleeding risk, lupus anticoagulant, heparin effect, mixing studies, and follow-up tests.

High Activated Partial Thromboplastin Time (aPTT) Test: Causes, Bleeding Risk, and...

Learn what a high anti-Xa test result means, including heparin and enoxaparin ranges, common causes, sample timing errors, bleeding risk, and dose follow-up.

High Anti-Xa Test Result: Causes, Heparin Dose, Bleeding Risk, and Meaning

High D-dimer with normal results can mean recent clot breakdown, inflammation, age, infection, surgery, pregnancy, or other causes. Learn when it needs urgent follow-up.

High D-Dimer With Normal Results: What This Blood Test Pattern Can...

Learn what high factor II activity means, including normal ranges, causes, prothrombin mutation links, clotting risk, related tests, and when to seek urgent care.

High Factor II (Prothrombin) Activity Test: Causes, Clotting Risk, and Meaning

Learn what high factor IX activity means, how it relates to clotting risk, common causes, when symptoms need urgent care, and how doctors interpret results with other coagulation tests.

High Factor IX Activity Test: Causes, Clotting Risk, and Meaning

Learn what a high factor V activity test means, how it differs from factor V Leiden, possible causes, clotting risk, follow-up tests, and when to seek care.

High Factor V Activity Test: Causes, Clotting Risk, and Meaning

Learn what a high factor VII activity test means, including common causes, clotting risk, normal ranges, follow-up tests, and when urgent care is needed.

High Factor VII Activity Test: Causes, Clotting Risk, and Meaning

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