15 Questions
Normal extracellular urea concentrations contribute significantly to the measured plasma osmolality.
False
In acute uraemia, the increased osmotic gradient does not alter cell hydration.
False
Normally low extracellular glucose concentrations contribute significantly to the osmolality.
False
In chronic uraemia, the osmotic effect of urea is reduced as the concentrations gradually equalize on the two sides of the membrane.
True
Severe hyperglycaemia, whether acute or chronic, causes a marked osmotic effect across cell membranes, with movement of water from cells into the extracellular compartment causing cellular dehydration.
True
Reduced levels of urea and glucose, unlike those of sodium, can cause cellular overhydration.
False
Urea diffuses into cells much faster than water.
False
Glucose is actively transported out of many cells.
False
Hyperglycaemia, whether acute or chronic, does not cause cellular dehydration.
False
What health condition is indicated by a T-score of -1.5 in bone density testing?
Low bone mass
According to ISCD recommendations, what Z-score range defines 'low bone mineral density for chronological age'?
-2.0 or lower
Which bone density measurement locations are considered in the WHO diagnostic T-score criteria for postmenopausal women and men over 50?
Lumbar spine, total hip, and femoral neck
What does a T-score of -2.8 indicate in bone density testing?
Osteoporosis
What recommended method is used by ISCD instead of T-scores for certain populations?
Age-adjusted Z-scores
How does a Z-score of -1.5 differ from a Z-score of -2.5 with regard to bone mineral density?
-1.5 indicates low bone mass, while -2.5 indicates normal bone density
Learn about the factors that can affect the validity of osmolality calculations, such as the presence of hyperproteinaemia, hyperlipidaemia, or certain osmotically active solutes in plasma. Understand how significant differences between measured and calculated osmolality can provide insights into possible alcohol or poisoning cases.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free