Re: The dose of a drug ?

[Guest guest]

Hi all-

This question would be tossed out of the 'real' exam, because both c

and d are correct. (See files section for previous discussions about

grains and mgs)

Assuming a 1gr= 60mg...

176lbs = 80kg

80kg x 0.25gr= 20gr

20gr x60 mg= 1200mg or 1.2gm

Now if the 1gr=65mg then the final answer would be 1300mg or 1.3gm

Dora

> The dose of a drug is 0.25gr/kg of body weight. If the patient

weighs

> 176 lbs, how many grams of the drugh should the patient recieve?

> a. 1.5 gms

> b. 1.4 gms

> c. 1.3 gms

> d. 1.2 gms

> I have worked the problem several times, I keep coming up with c.

1.3

> gms, the book says the answer is d. 1.2 gms, what am I doing wrong?

[Guest guest]

Hi,

Again two things to remember:

PTCB considers the approximate value of 1 grain to be 65mg.

Second thing to remember is that you will never have questions on the

PTCB exam that are so close. In another words the possible answers

would be: a. 2.4 g b. 3.8 g c. 0.8 g d. 1.2g. Whether you used 60

mg or 65 mg as your approximate value, you will get close enough to

the real answer to answer it correctly.

Respectfully,

Joe Medina, CPhT

--------------

The dose of a drug is 0.25gr/kg of body weight. If the patient

weighs 176 lbs, how many grams of the drugh should the patient

recieve?

a. 1.5 gms

b. 1.4 gms

c. 1.3 gms

d. 1.2 gms

I have worked the problem several times, I keep coming up with

c. 1.3 gms

the book says the answer is d. 1.2 gms, what am I doing wrong?

[Guest guest]

Thank you Dora! And said very nicely!!!

I did try to sum this up and I think, nay KNOW I have tackled this

question on this site many times before. In fact there is a document

on this in the file section from way back when!!!

I appreciate you steering " the poster " back to the the most recent

response!

Dear Poster

Please refer to your original question and my response onmessages #

2969 and 2970...

Respectfully,

Jeanetta Mastron

Founder Owner

> > The dose of a drug is 0.25gr/kg of body weight. If the patient

> weighs

> > 176 lbs, how many grams of the drugh should the patient recieve?

> > a. 1.5 gms

> > b. 1.4 gms

> > c. 1.3 gms

> > d. 1.2 gms

> > I have worked the problem several times, I keep coming up with c.

> 1.3

> > gms, the book says the answer is d. 1.2 gms, what am I doing

wrong?

[Guest guest]

I CANNOT SAY WHAT PTCB USES! I do not know. I have not taken the exam

since l996. But I do know that it does not matter if it is 65 or 60

because ONLY one possible answer will be close to your calculated one

IF you did it correctly with either 60 or 65 mg = 1 grain

And THIS is WHAT I was saying in my post of 2669.

No argument here on what Joe wrote, except the conversion used on the

exam.

******

Also anyone wanting more information or exact calculation methods

please use my File section where you will find a document that I

loaded on 6-18-03 a whole month before " Poster's " question in

response to one dear friend in Oklahoma at a military base with out

ability to get to this site.I emailed it to her. For your convenience

I will place it here in this post. But we all know the distortion

that happens with the ratio/proportions. This is WHY you need/must

open oup the file document yourself.

It is under: Conversion.doc

Conversion factor: 60 or 65 mg?

In actuality the closest number to the most accurate amount is 64.5

mg = 1 grain or gr i

gr i = 60 mg but also i gr = 65mg

Which one do I use?

Rule of thumb:

If the number ends in a 5 more than likely it will be the 65 mg = 1

grain. However if the number ends with a zero (0) there is a

possibility is that the conversion factor may be either 60 or 65 mg.

Here are examples of the math and decision process:

Example #1:

A pain reliever is 325 mg. How many grains is this equal to? 325 ends

in a 5, try 65 mg = 1 grain First:

325mg divided by 65mg/1grain = 5 grain

or

with ratio/proportion method:

65 mg........325 mg

_______ = ______

1 gr..........X gr

1grain x 325mg

_______________ = 5 grain

65 mg

Example #2:

A pain reliever has 300mg. How many grains of drug is this equal to?

300 mg divided by 60 mg/grain = 5 grain

ratio proportion

60mg.......300 mg

_____..=.._______

1grain......X gr

1gr x 300 mg

___________ = 5 grains

60 mg

Jeanetta Mastron Copyrighted 6-18-03

> Hi,

>

> Again two things to remember:

>

> PTCB considers the approximate value of 1 grain to be 65mg.

>

> Second thing to remember is that you will never have questions on

the

> PTCB exam that are so close. In another words the possible answers

> would be: a. 2.4 g b. 3.8 g c. 0.8 g d. 1.2g. Whether you used

60

> mg or 65 mg as your approximate value, you will get close enough to

> the real answer to answer it correctly.

>

> Respectfully,

>

> Joe Medina, CPhT

>

> --------------

> The dose of a drug is 0.25gr/kg of body weight. If the patient

> weighs 176 lbs, how many grams of the drugh should the patient

> recieve?

>

> a. 1.5 gms

> b. 1.4 gms

> c. 1.3 gms

> d. 1.2 gms

> I have worked the problem several times, I keep coming up with

> c. 1.3 gms

>

> the book says the answer is d. 1.2 gms, what am I doing wrong?

[Guest guest]

Hi Jeanetta,

The first practice questions of which PTCB posted stated their answer

for 1 grain to be 65 mg. Since this was a practice exam, I did not

think this to be copyright material. Of course, again, whether you

use 60 mg or 65 mg, you will be close enough to the correct answer.

Respectfully,

Joe Medina, CPhT

-------------

I CANNOT SAY WHAT PTCB USES! I do not know. I have not taken the exam

since l996. But I do know that it does not matter if it is 65 or 60

because ONLY one possible answer will be close to your calculated one

IF you did it correctly with either 60 or 65 mg = 1 grain

And THIS is WHAT I was saying in my post of 2669.

No argument here on what Joe wrote, except the conversion used on the

exam.

[Guest guest]

Dear Joe Medina,

Thank you for this information. I was not aware of where you got this

information. Glad to know that it is on the original practice exam.

Do you know if it is still posted anywhere on the current exam or the

preparation infor or???

I do not consider it a copyright material if you are rephrasing it.

Remember the Fair Use Laws for educational purposes and also you

have not cut and pasted with out quotation marks or references.

I thought perhaps the last time that you took the test may have been

after l996 (when I took it) and there may have been an 'announcement'

or bit in the directions of the exam. That is how I thought that

you 'knew' that PTCB exam uses 65mg.

The good news is: We ARE SAYING THE SAME THING here! No matter which

is used 65 or 60 mg the answer one 'correctly' calculates will either

be exact or very very close to the correct answer.

Good News!

Respectfully,

Jeanetta Mastron CPhT BS Chemistry

Founder/Owner

> Hi Jeanetta,

>

> The first practice questions of which PTCB posted stated their

answer

> for 1 grain to be 65 mg. Since this was a practice exam, I did not

> think this to be copyright material. Of course, again, whether you

> use 60 mg or 65 mg, you will be close enough to the correct

answer.

>

> Respectfully,

>

> Joe Medina, CPhT

>

> -------------

> I CANNOT SAY WHAT PTCB USES! I do not know. I have not taken the

exam

> since l996. But I do know that it does not matter if it is 65 or 60

> because ONLY one possible answer will be close to your calculated

one

> IF you did it correctly with either 60 or 65 mg = 1 grain

>

> And THIS is WHAT I was saying in my post of 2669.

>

> No argument here on what Joe wrote, except the conversion used on

the

> exam.