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What Is PVI on a Pulse Oximeter and What the Numbers Mean
PVI on a pulse oximeter measures fluid responsiveness in real time. Learn what the numbers mean and how clinicians use it at the bedside.
What Does a Scaphoid Fracture Look Like? Symptoms & Imaging
Scaphoid fractures often look like sprains and don’t show up on X-rays. Learn how doctors spot them on MRI and CT, and what affects healing time.
What Does a Normal Neck Ultrasound Look Like?
Learn what healthy thyroid tissue, lymph nodes, and salivary glands look like on a neck ultrasound, and how to make sense of your results.
What Is an ICP Sensor? Function, Location & Symptoms
Learn what an ICP sensor does, where to find it, and how to recognize the signs of a failing one before it causes bigger engine problems.
How to Collect DNA: Swabs, Saliva, Hair, and More
From cheek swabs to saliva and hair, learn how different DNA collection methods work and how to keep samples uncontaminated and properly stored.
What Is MIBG? Diagnostic Scans and Cancer Therapy
MIBG is a compound used in both imaging and cancer treatment, particularly for rare tumors like neuroblastoma. Here’s how it works.
Does Anxiety Affect Echocardiogram Results?
Anxiety can affect your heart rate and breathing during an echo, but cardiologists know how to interpret the results accurately.
Are Lancets Needles? What They Are and How They Differ
Lancets are needle-like but designed specifically for fingerstick blood draws. Learn how they work, how to choose the right one, and how to use them safely.
How to Draw Sodium: Tubes, Order, and Technique
Learn the right tube, draw order, and technique for accurate sodium blood tests, plus common errors that can skew your results.
How to Determine Axis Deviation on an ECG
Learn how to quickly determine QRS axis deviation on an ECG, what left, right, and extreme deviations mean clinically, and common mistakes to avoid.
What Happens When You Microwave Urine for a Drug Test
Microwaving urine to pass a drug test sounds plausible, but the temperature requirements, chemistry changes, and collector training make it very hard to pull off.
Is 22G Smaller Than 18G? What the Numbers Mean
Yes, 22G needles are smaller than 18G. Learn how gauge numbers work and what the size difference means for pain and medical use.
How Is Cervical Stenosis Diagnosed? Exams & Imaging
Learn how doctors diagnose cervical stenosis, from physical exams and reflex tests to MRI, X-rays, and nerve studies.
How to Pass the Farnsworth Lantern Test (FALANT)
Learn what the FALANT color vision test involves, why people fail it, and practical tips to prepare for test day.