| US abdomen (hepatobiliary) | fast 6–8 h (GB distension, less gas) |
| US pelvis (transabdominal) | full bladder (drink ~1 L, 1 h before); TVS: empty bladder |
| US renal/KUB | moderately full bladder |
| Barium swallow | none (meal: NBM 6 h) |
| Barium meal / follow‑through | NBM 6–8 h; avoid smoking (gastric secretion) |
| Barium enema / CT colonography | low‑residue diet 2–3 days, bowel preparation (osmotic laxatives), faecal tagging for CTC; antispasmodic (hyoscine butylbromide or glucagon) |
| IVU (historical) | bowel preparation, NBM 4–6 h, renal function, allergy history |
| Contrast CT | allergy history (previous contrast reaction), eGFR in at‑risk patients (age > 60, CKD, diabetes on metformin, nephrotoxins), metformin (apply the IV-contrast/arterial-procedure rules in Concept 16), hydration, IV cannula (antecubital for CTA), routine fasting is not required for intravascular contrast alone under ACR guidance; follow separate sedation/anaesthesia or examination-specific instructions, oral contrast for bowel opacification when indicated |
| MRI | safety screening questionnaire (pacemaker, implants, IOFB, aneurysm clips, pregnancy), remove metal/cards, ear protection, claustrophobia (anxiolysis/sedation), eGFR if gadolinium in at‑risk patients; MRCP: fast 4 h; MR enterography: oral mannitol/PEG |
| Mammography | avoid deodorant/talc (mimic calcifications); schedule after menses (less tenderness) |
| HSG | usually scheduled after menstruation and before ovulation (often days 7–10); timing alone does not exclude pregnancy. Assess pregnancy possibility and pelvic infection; antibiotics depend on risk and local policy. |
| MCU | sterile catheterisation, antibiotic prophylaxis per policy |
| Nuclear medicine | thyroid: review thyroid drugs, iodine exposure and amiodarone with the nuclear medicine/prescribing team; any interruption is study-specific and supervised, not a blanket instruction to stop medicines; FDG PET: fast 4–6 h, glucose < 150–200 mg/dL, avoid exercise; MPI: stop caffeine (vasodilator stress), beta‑blockers per protocol; HIDA: fast 4 h (not > 24 h); Meckel's: fasting, H2 blocker |
| Interventional | indication, consent, coagulation (INR/platelets), antiplatelet/anticoagulant management (SIR consensus), fasting, IV access, antibiotics where indicated |
| Women of reproductive age | pregnancy enquiry (and test when in doubt) before ionising pelvic/abdominal studies (Concept 7) |
| Paediatric | sedation/feed‑and‑wrap for MRI, Image Gently protocols, child‑friendly environment |