['To estimate total sodium (Na) and potassium (K) intake using non-fasting morning urine specimens among Lebanese elementary (6-10 year old) schoolchildren.', 'A national cross-sectional study was conducted. A multistage cluster sampling procedure was used to select a representative sample of 1403 healthy children from the eight districts of Lebanon. Age, anthropometric measurements, and urine samples were collected and analyzed for Na, K, and creatinine (Cr).', 'The ratios of Na and K to Cr were 23.93\xa0±\xa015.54\xa0mM/mM (4.86\xa0±\xa03.16\xa0mg/mg) and 11.48\xa0±\xa05.82\xa0mM/mM (3.97\xa0±\xa02.01\xa0mg/mg), respectively, and showed differences (P value <0.001) between age groups. No differences were found between boys and girls in all the measured Na and K parameters. The estimated mean Na intake was 96.57\xa0±\xa061.67\xa0mM/day (2.220\xa0±\xa01.418\xa0g/day or 5.69\xa0±\xa03.64\xa0g NaCl/day) and exceeded the upper limit of intake in half the children. Estimated K intake was 46.6\xa0±\xa023.02\xa0mM/day (1.822\xa0±\xa00.900\xa0g/day), and almost all children failed to meet the recommended daily K intake. The high Na/K ratio (2.361\xa0±\xa01.67\xa0mM/mM or 1.39\xa0±\xa00.98\xa0mg/mg) resulted from a combination of high Na and low K intake but was mostly affected by K intake.'] Is elevated urinary Na/K ratio among Lebanese elementary school children attributable to low K intake?