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3.5 Numerals. The following rules apply to numeral usage in Sections II and III.
3.5.1 General style. In Sections II and III, always use Arabic numerals, even at the beginning of a sentence:
3 structures, 2 arteries, 1st branchial arch, 6-20 weeks, 20-40%
Numerals from 1000 to 9999 do notneed a comma unless they appear in a summed column along with five-digit numerals. Numeral ranges are joined by a hyphen, not an en dash.
3.5.2 Symbols. Always use < and > symbols to connote “more than,” “less than,” “younger than,” and “older than”:
<2 years of age, >50 years of age, BP >90 mm Hg, <3 kg/day
Use ↑ and ↓ symbols to indicate increased or higher and decreased or lower, and use → to indicate “leads to” in a series or a processes. You can also use → to indicate “leads to” or “causes” in text; however, if you choose to use → in text, make sure your meaning is clear.
P-450 gets a hyphen but contains no spaces and no subscript.
PO should be used in place of by mouth.
Primary, secondary, etc., are expressed as 1°, 2°, etc.
QT interval, ST segment, etc., are closed up (not Q-T or S-T).
Spinal cord levels appear as C7, T1, L5, etc. (no space between the symbol and the number).
T3, T4 always get subscripts.
Temperatures are expressed in degrees centigrade: 38.1°C (no space).
tPA is preferred over t-PA or TPA.
Ultrasound should be spelled out (not U/S or US).
Week, month, and year should be abbreviated (wk, mo, yr) only in tables, equations, virgule constructions, and figures with space constraints.
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P-450 gets a hyphen but contains no spaces and no subscript.
PO should be used in place of by mouth.
Primary, secondary, etc., are expressed as 1°, 2°, etc.
QT interval, ST segment, etc., are closed up (not Q-T or S-T).
Spinal cord levels appear as C7, T1, L5, etc. (no space between the symbol and the number).
T3, T4 always get subscripts.
Temperatures are expressed in degrees centigrade: 38.1°C (no space).
tPA is preferred over t-PA or TPA.
Ultrasound should be spelled out (not U/S or US).
Week, month, and year should be abbreviated (wk, mo, yr) only in tables, equations, virgule constructions, and figures with space constraints.