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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 45

Learn what a high factor VIII activity test means, including common causes, inflammation links, von Willebrand factor, clot risk, repeat testing, and follow-up steps.

High Factor VIII Activity Test: Causes, Clot Risk, Inflammation, and Meaning

High factor X activity can suggest increased clotting protein activity, but it is not a diagnosis by itself. Learn what high factor X means, common causes, clotting risk, related tests, and when follow-up or urgent care is needed.

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

High factor XI activity may signal higher clotting risk, especially when persistent. Learn common causes, normal ranges, follow-up tests, and when symptoms need urgent care.

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

Understand what a high factor XII activity test means, including reference ranges, causes, clotting test patterns, thrombosis context, follow-up tests, and when urgent care matters.

High Factor XII Activity Test: Causes, Clotting Results, and Meaning

Learn what a high fibrinogen blood test means, including common causes, inflammation links, clotting and heart risk, urgent symptoms, test accuracy, and follow-up tests.

High Fibrinogen Blood Test: Causes, Inflammation, Clotting Risk, and Meaning

Learn what a high INR blood test means, including warfarin targets, bleeding risk, common causes, urgent symptoms, follow-up tests, and treatment options.

High International Normalized Ratio (INR) Blood Test: Causes, Warfarin, Bleeding Risk,...

Learn what a high PTT blood test means, including common causes, bleeding risk, heparin effects, lupus anticoagulant, factor deficiencies, follow-up tests, and when urgent care is needed.

High Partial Thromboplastin Time (PTT) Test: Causes, Bleeding Risk, and Meaning

Learn what a high prothrombin time test means, how PT relates to INR, common causes such as warfarin, vitamin K deficiency and liver disease, and when bleeding risk needs urgent care.

High Prothrombin Time (PT) Test: Causes, INR, Bleeding Risk, and Meaning

High thrombin time can reflect heparin, thrombin inhibitors, low fibrinogen, dysfibrinogenemia, DIC, liver disease, or fibrin breakdown products. earn what the result means and which follow-up tests help find the cause.

High Thrombin Time Test: Causes, Fibrinogen Problems, and Meaning

High vWF antigen means increased von Willebrand factor protein, often from inflammation, endothelial activation, pregnancy, estrogen, aging, or clot risk. Learn causes, related tests, and when follow-up matters.

High von Willebrand Factor (vWF) Antigen Test: Causes, Inflammation, Clot Risk,...

Understand INR and warfarin results, including common target ranges, high and low INR causes, testing timing, diet and medication effects, and when urgent care matters.

INR and Warfarin: Interpreting Anticoagulation Results Without Overdoing It

Learn the INR normal range, what high and low INR results mean, and how INR is used to monitor warfarin, bleeding risk, clotting risk, liver problems, and vitamin K status.

International Normalized Ratio (INR) Normal Range: Reference Values and Meaning

Learn what a low aPTT blood test means, including common causes, false low results, clotting risk, normal ranges, follow-up testing, and when to seek urgent care.

Low Activated Partial Thromboplastin Time (aPTT) Test: Causes, Clotting Risk, and...

Low anti-Xa test result meaning, common causes, heparin dose timing, clot risk, therapeutic ranges, and what clinicians check before adjusting UFH or LMWH.

Low Anti-Xa Test Result: Causes, Heparin Dose, Clot Risk, and Meaning

Learn what low factor II activity means, including prothrombin deficiency, vitamin K deficiency, warfarin effect, liver disease, DIC, bleeding risk, and follow-up testing.

Low Factor II (Prothrombin) Activity Test: Causes, Bleeding Risk, and Meaning

Low factor IX activity can mean hemophilia B, vitamin K deficiency, warfarin effect, liver disease, or inhibitors. Learn severity levels, bleeding risks, follow-up tests, and when urgent care is needed.

Low Factor IX Activity Test: Causes, Hemophilia B, Bleeding Risk, and...

Learn what a low factor V activity test means, including common causes, bleeding risk, PT and aPTT patterns, factor V deficiency, acquired inhibitors, and follow-up testing.

Low Factor V Activity Test: Causes, Bleeding Risk, and Meaning

Learn what low factor VII activity means, why it prolongs PT, common causes such as vitamin K deficiency, warfarin, liver disease, inherited deficiency, bleeding risks, and follow-up testing.

Low Factor VII Activity Test: Causes, Prolonged PT, Bleeding Risk, and...

Low factor VIII activity can signal hemophilia A, von Willebrand disease, or an acquired inhibitor. Learn causes, severity levels, bleeding risks, follow-up tests, and safety steps.

Low Factor VIII Activity Test: Causes, Hemophilia A, Bleeding Risk, and...

Learn what a low factor X activity test means, including common causes, bleeding risk by level, follow-up testing, treatment options, and when urgent care is needed.

Low Factor X Activity Test: Causes, Bleeding Risk, and Meaning

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