BNF for Children 2011-2012

Approximate conversions and unitslb kg stones kg mL fl oz1 0.45 1 6.35 50 1.82 0.91 2 12.70 100 3.53 1.36 3 19.05 150 5.34 1.81 4 25.40 200 7.05 2.27 5 31.75 500 17.66 2.72 6 38.10 1000 35.27 3.18 7 44.458 3.63 8 50.809 4.08 9 57.1510 4.54 10 63.5011 4.99 11 69.8512 5.44 12 76.2013 5.90 13 82.5514 6.35 14 88.9015 95.25Length1 metre (m) = 1000 millimetres (mm)1 centimetre (cm) = 10 mm1 inch (in) = 25.4 mm1 foot (ft) = 12 inches12 inches = 304.8 mmMass1 kilogram (kg) = 1000 grams (g)1 gram (g) = 1000 milligrams (mg)1 milligram (mg) = 1000 micrograms1 microgram = 1000 nanograms1 nanogram = 1000 picogramsPrescribing for childrenWeight, height, and genderThe table below shows the mean values for weight,height and gender by age; these values have beenderived from the UK-WHO growth charts 2009 andUK1990 standard centile charts, by extrapolating the50th centile, and may be used to calculate doses in theabsence of actual measurements. However, the child’sactual weight and height might vary considerably fromthe values in the table and it is important to see the childto ensure that the value chosen is appropriate. In mostcases the child’s actual measurement should beobtained as soon as possible and the dose re-calculated.Age Weight HeightkgcmFull term neonate 3.5 511 month 4.3 552 months 5.4 583 months 6.1 614 months 6.7 636 months 7.6 671 year 9 753 years 14 965 years 18 1097 years 23 12210 years 32 13812 years 39 14914 year-old boy 49 16314 year-old girl 50 159Adult male 68 176Adult female 58 164Volume1 litre = 1000 millilitres (mL)1 millilitre (1 mL) = 1000 microlitres1 pint 568 mLOther units1 kilocalorie (kcal) = 4186.8 joules (J)1000 kilocalories (kcal) = 4.1868 megajoules (MJ)1 megajoule (MJ) = 238.8 kilocalories (kcal)1 millimetre of mercury (mmHg) = 133.3 pascals (Pa)1 kilopascal (kPa) = 7.5 mmHg (pressure)Plasma-drug concentrations in BNF for Childrenare expressed in mass units per litre (e.g. mg/litre).The approximate equivalent in terms of amount ofsubstance units (e.g. micromol/litre) is given inbrackets.