tender for procurement of polysomnography; i. specifications for high-definition video polysomnography a. sleep studies, or polysomnography (psg), are classified into four levels by the american academy of sleep medicine (aasm) based on comprehensiveness, setting, and parameters monitored. level 1 sleep testing (in-lab, attended polysomnography) is considered the gold standard because it measures the most complete set of physiological signals under direct professional supervision in a controlled environment, giving the most accurate and reliable diagnosis of sleep disorders. (other test levels (2–4) use fewer channels and are usually unattended, so they are useful but not as comprehensive.) ii. level 1 sleep study a level 1 sleep study, or polysomnography (psg) monitors multiple physiological parameters overnight during sleep: 1 minimum channel requirements: i. brain electrical activity: eeg (electroencephalogram): 4-6 channels (central, frontal, occipital derivations) for sleep staging. ii. eye movements: eog (electro-oculogram): 2 channels (right/left). iii. muscle activity: emg (electromyogram): 1 submental (chin) + 2 leg channels. iv. lungs: respiratory: nasal pressure airflow + thermistor, thoracic/abdominal belts, spo2 ≥1 hz sampling. v. cardiac: ecg channels along with bp, pr and hrv & pulse oximetry vi. others: snore microphone, body position sensor. 2 technical performance standards i. sampling: eeg/eog/emg/ecg ≥200 hz (recommended 500 hz), airflow/effort ≥25 hz (recommended 100 hz), spo2 continuous. ii. filters: eeg 0.3-35 hz, eog same, emg 10-100 hz, airflow 0.1-10 hz; 50/60 hz notch filter. iii. amplifiers: input impedance ≥10 kω (eeg ≥1 mω recommended), cmrr ≥100 db, a/d resolution ≥12-bit. 3 software and integration features i. real-time display (5-30 sec epochs), aasm-compliant manual/automated scoring for stages, arousals, ahi, plms. ii. audio-synchronization (±1 sec accuracy), hl7/xml export for emr integration. iii. calibration signals (50 μv), artifact rejection, support for mslt/mwt/pap titration; ce/iso certified sensors (disposable/reusable electrodes, rip belts). 4 additional detailed specifications a. parent unit portable, ≤250g including eeg headbox, full patient mobility. b. stationary cum ambulatory use. c. high-resolution touch colour display, size ≤110 x 74 x 24mm. d. modular, minimum 31 channels, upgradable to 74.