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🧮 Kalkil Dòz · Leson 2 sou 5 · 6 min

Dòz Ou Vle a Sou Dòz Ou Genyen an, Fwa Kantite a

Desired Over Have, Times Quantity

💊 Preskripsyon an se 500 mg. Boutèy la di 250 mg pa 5 mL. Yon sèl fòmil reponn tout kesyon kalite sa a, epi egzamen an ka ba ou plizyè ladan yo.

💊 The order is 500 mg. The bottle says 250 mg per 5 mL. One formula answers every question of this type, and the exam can give you several of them.

💡 Ide prensipal

Dòz ou vle a ÷ dòz ou genyen an × kantite a, ak inite ki koresponn. Si repons lan sanble absid, konvèsyon an mal fèt.

Desired ÷ Have × Quantity, with matching units. If the answer looks absurd, the conversion is wrong.

🧠 Poukisa sa enpòtan

Fòmil la: dòz ou VLE a ÷ dòz ou GENYEN an (dòz ki disponib la) × KANTITE a (volim oswa fòm li vini an) = kantite pou bay. Preskripsyon 500 mg, ou genyen 250 mg pa 5 mL: 500 ÷ 250 × 5 = 10 mL. Preskripsyon 0.25 mg, ou genyen konprime 0.125 mg: 0.25 ÷ 0.125 × 1 = 2 konprime. Inite dòz ou vle a ak dòz ou genyen an dwe KORESPONN, kidonk konvèti anvan: preskripsyon 1 g, ou genyen konprime 500 mg, konvèti 1 g an 1,000 mg, apre 1,000 ÷ 500 = 2 konprime. Analiz dimansyonèl bay menm repons lan lè ou aliyen inite yo pou yo anile youn lòt. Verifye rezilta a ak bon sans: yon dòz 15 konprime oswa 0.02 mL prèske toujou vle di yon erè konvèsyon. Pou enjektab yo, chwazi sereng ki mezire volim lan byen: yon sereng 1 mL pou ti dòz yo, epi awondi selon gradyasyon sereng lan. Koupe sèlman konprime ki gen liy pou koupe yo, epi pa janm koupe oswa kraze konprime enteric-coated oswa extended-release sof si etikèt pwodui a pèmèt sa.

The formula: DESIRED dose ÷ HAVE (the dose on hand) × QUANTITY (the volume or form it comes in) = amount to give. Order 500 mg, have 250 mg per 5 mL: 500 ÷ 250 × 5 = 10 mL. Order 0.25 mg, have 0.125 mg tablets: 0.25 ÷ 0.125 × 1 = 2 tablets. The units of desired and have must MATCH, so convert first: order 1 g, have 500 mg tablets, convert 1 g to 1,000 mg, then 1,000 ÷ 500 = 2 tablets. Dimensional analysis gives the same answer by lining up units so they cancel. Sanity-check the result: a dose of 15 tablets or 0.02 mL almost always means a conversion error. For injectables, choose the syringe that measures the volume accurately: a 1 mL syringe for small doses, and round to the syringe's gradations. Split only tablets that are scored for splitting, and never split or crush enteric-coated or extended-release tablets unless the product labeling allows it.

🏥 Nan lavi reyèl

🧴 Preskripsyon: amoxicillin 400 mg PO. Disponib: sispansyon 250 mg pa 5 mL. 400 ÷ 250 = 1.6; epi 1.6 × 5 = 8 mL. Enfimyè a mezire 8 mL nan yon sereng oral. Yon kanmarad klas ki te bliye multipliye pa kantite a bay 1.6 mL, yon senkyèm nan dòz la. Fòmil la gen twa pati paske tout twa enpòtan.

🧴 Order: amoxicillin 400 mg PO. Available: 250 mg per 5 mL suspension. 400 ÷ 250 = 1.6; 1.6 × 5 = 8 mL. The nurse measures 8 mL in an oral syringe. A classmate who forgot to multiply by the quantity gives 1.6 mL, one fifth of the dose. The formula has three parts because all three matter.

📌 Sa pou retni

  • Dòz ou vle a sou dòz ou genyen an, fwa kantite ki disponib laDesired over have, times the quantity on hand
  • Konvèti pou inite yo koresponn anvan ou divizeConvert so the units match before dividing
  • Repons absid yo siyal yon erè konvèsyonAbsurd answers signal a conversion mistake

📖 Tèm nan leson sa a

Dòz vle sou dòz genyen (Desired over have): Fòmil kalkil dòz la: dòz ou vle a divize pa dòz ou genyen an, miltipliye pa kantite li vini ladan an.

✅ Teste tèt ou

Preskripsyon an se 750 mg yon antibyotik, sispansyon ki disponib la se 500 mg pa 5 mL, konbyen mL enfimyè a dwe bay?The order is for 750 mg of an antibiotic. The suspension available is 500 mg per 5 mL. How many mL should the nurse give?
  1. 5 mL
  2. 10 mL
  3. 7.5 mL
  4. 15 mL

Repons: C · 7.5 mL

750 ÷ 500 = 1.5; 1.5 × 5 mL = 7.5 mL, 5 mL se senpleman volim ki sou etikèt la epi li ta bay sèlman 500 mg, de tyè nan dòz yo preskri a.

750 ÷ 500 = 1.5; 1.5 × 5 mL = 7.5 mL. 5 mL is simply the volume on the label and would deliver only 500 mg, two-thirds of the ordered dose.

Preskripsyon an se 0.5 g yon medikaman, konprime yo disponib kòm 250 mg, konbyen konprime enfimyè a dwe bay?The order is for 0.5 g of a medication. Tablets are available as 250 mg. How many tablets should the nurse give?
  1. 2 tablets
  2. 1 tablet
  3. 5 tablets
  4. 0.5 tablet

Repons: A · 2 tablets

0.5 g = 500 mg; 500 ÷ 250 = 2 konprime, 0.5 konprime soti nan envèse divizyon an, 250 ÷ 500 olye de 500 ÷ 250.

0.5 g = 500 mg; 500 ÷ 250 = 2 tablets. 0.5 tablet comes from inverting the division, 250 ÷ 500 instead of 500 ÷ 250.

Yon preskripsyon mande 60 mg yon medikaman enjektab, flakon an gen 80 mg pa 2 mL, ki volim enfimyè a dwe rale?An order calls for 60 mg of an injectable medication. The vial contains 80 mg per 2 mL. What volume should the nurse draw up?
  1. 0.75 mL
  2. 1.5 mL
  3. 2.5 mL
  4. 3 mL

Repons: B · 1.5 mL

60 ÷ 80 = 0.75; 0.75 × 2 mL = 1.5 mL, 0.75 mL soti nan rete nan 60 ÷ 80 epi bliye multipliye pa 2 mL ki kenbe 80 mg la.

60 ÷ 80 = 0.75; 0.75 × 2 mL = 1.5 mL. 0.75 mL comes from stopping at 60 ÷ 80 and forgetting to multiply by the 2 mL that holds the 80 mg.

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