Oxytocin Injection, 10 units/mL Vial

ObstetricsVital, 99% service targetPrimary vendor Harborline Pharmaceuticals, lead 1 day, ordered every 3 days63323001207

Stock position

On hand
399 vial16.7 days of supply
On order
0 vialnothing open
Forecast rate
23.8 vial/daynext 30 days
Demand over 4 days
104 viallead time plus review period
Safety stock
29 vialempirical 99th percentile of forecast error
Reorder point
132 vialabove
Stockout
Thu Oct 1
Recommended order
noneby Tue Sep 29
Inventory value
$678at $1.70 per vial

How the forecast was made

Exponential smoothing12% weekly error, unbiased31% better than naive

A weighted recent average that learns the weekday pattern and any trend. Recent days count more than old ones.

Report card: the model was fit on history up to Tue Jul 21 and scored on the 56 days after. Weekly totals were off by 12% on average (25% day by day), and it showed no systematic bias. A same-weekday-last-week guess would have been off by 17%.

Report card, week by week

Week ofUsedForecastErrorError %
Tue Jul 21135164+2921%
Tue Jul 28131164+3325%
Tue Aug 4177164-137%
Tue Aug 11186164-2212%
Tue Aug 18185164-2111%
Tue Aug 25172164-85%
Tue Sep 1177164-137%
Tue Sep 8184164-2011%
All 8 weeks1,3471,311-363%

Weekly totals in vial. Error is forecast minus what was used, so a positive number means the model ran high. This window was hidden from the model when it was fit.

Demand forecast

last 180 days and the next 30
02855todayreport card windowThu Mar 19Wed Oct 14
actual forecast, 80% and 95% range what the model said during the report card windowvial/day

The model only knows the usage history. If you know something it does not, a coming surge, a new service line, a product being dropped, adjust the forecast and the stock math follows.

Projected on hand

0safety stock 29runs out Thu Oct 1tomorrowTue Oct 6
Projected on hand, vial: today's stock plus open orders on their expected dates, minus the forecast, day by day.

Lots and expiry

Earliest-expiry-first simulation against the forecast. Waste is what remains in a lot on its expiry date.

LotQuantityExpiresDaysUnit costProjected waste
L00111399Wed Mar 1534$1.700 vial · $0

Vendors and prices, last 90 days

VendorPart numberVendor descriptionSells byPaid per vialInvoices90-day spendPairing
Harborline Pharmaceuticals63323001207OXYTOCIN 10 [USP'U]/ML VIAL EAEA of 1$1.5433$3,947NDC exact