Formula sheets, the key method steps for every topic and 6 practice problems, with full solutions at the back.
Where universal screening for group B streptococcus is used, when is the vaginal–rectal swab usually taken?
A healthy newborn is jittery. Which finding helps tell jitteriness from a seizure?
A patient weighs 90 kg. The prescribed dose is 10 mg/kg per day, given in 4 equal doses. How many milligrams D are given per dose?
A child weighing 16 kg is prescribed 20 mg/kg per dose of an oral suspension that contains 125 mg in 5 mL. What volume V do you give?
500 mL was ordered over 8 hours. After 6 hours you find that 140 mL is still in the bag, and the order must still finish on time. To what rate R in mL/h must the pump be reset?
1000 mL was ordered over 10 hours. After 5 hours you find that 600 mL is still in the bag, and the order must still finish on time. By what percentage Δ must the original pump rate be increased?
Answer: A · At about 36 to 37 weeks
Colonisation can come and go, so the swab is taken late in pregnancy, close to birth. A positive result leads to intrapartum antibiotics to protect the newborn. Some countries use a risk-based approach instead.
Answer: C · Jitteriness stops when the limb is gently held
Jitteriness is a rhythmic tremor that is stimulus-sensitive and stops when the limb is held or flexed. Seizures continue when restrained and may include eye deviation, apnoea or lip smacking. Glucose and calcium are checked in both.
Answer: D = 225 mg
Dose calculation: the amount to give equals what is prescribed divided by what you have, times the quantity it comes in: amount = (desired dose/stock strength) × stock volume. Always keep the units the same (convert g to mg, mg to mcg first) and check that the answer is sensible.
Answer: V = 12.8 mL
Dose calculation: the amount to give equals what is prescribed divided by what you have, times the quantity it comes in: amount = (desired dose/stock strength) × stock volume. Always keep the units the same (convert g to mg, mg to mcg first) and check that the answer is sensible.
Answer: R = 70 mL/h
Infusion rates: a pump is set in mL/h = volume/time in hours. A gravity drip is counted in drops per minute: gtt/min = volume (mL) × drop factor (gtt/mL)/time (min). The drop factor is printed on the tubing package: macrodrip sets deliver 10, 15 or 20 gtt/mL (blood sets often 10 gtt/mL in the US, 15 in the UK) and microdrip sets 60 gtt/mL. Always use the drop factor the question or package gives.
Many hospitals allow such an adjustment up to 25% without a new order; check local policy.
Answer: Δ = 20 %
Infusion rates: a pump is set in mL/h = volume/time in hours. A gravity drip is counted in drops per minute: gtt/min = volume (mL) × drop factor (gtt/mL)/time (min). The drop factor is printed on the tubing package: macrodrip sets deliver 10, 15 or 20 gtt/mL (blood sets often 10 gtt/mL in the US, 15 in the UK) and microdrip sets 60 gtt/mL. Always use the drop factor the question or package gives.
Many hospitals allow such an adjustment up to 25% without a new order; check local policy.
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